cmake METAL examples

PixarAnimationStudios/OpenSubdiv CMakeLists.txt :396 

find_package(Metal)

lighttransport/tinyusdz src/osd/CMakeLists.txt :366 

find_package(Metal)

H-uru/Plasma CMakeLists.txt :133 

find_package(Metal)

libocca/occa CMakeLists.txt :217 

find_package(METAL)